Table B-9c. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Rail for Selected UN Number (1) for the United States: 2012
(Estimates are based on data from the 2012 Commodity Flow Survey)
| UN number | UN description | Value | Tons | Ton-miles (2) |
Average miles per shipment — coefficient of variation of number |
|||
|---|---|---|---|---|---|---|---|---|
| Coefficient of variation of number | Standard error of percent of total | Coefficient of variation of number | Standard error of percent of total | Coefficient of variation of number | Standard error of percent of total | |||
| Total | 7.7 | 0.2 | 6.2 | 0.2 | 6.9 | 1.9 | 2.9 | |
| 1005 | Ammonia, anhydrous | 27.9 | 3.7 | 24.7 | 4.2 | 19.2 | 4.9 | 8.8 |
| 1013 | Carbon dioxide | 24.5 | 0.9 | 29.1 | 6.1 | 28.7 | 8.0 | 15.6 |
| 1017 | Chlorine | 26.9 | 4.9 | 27.2 | 5.6 | 27.4 | 7.3 | 7.1 |
| 1040 | Ethylene oxide or ethylene oxide with nitrogen | 38.7 | 1.9 | 48.0 | 1.7 | S | S | 30.1 |
| 1075 | Petroleum gases, liquefied or liquefied petroleum gas | 36.9 | 1.8 | 24.0 | 1.4 | 29.8 | 8.2 | 22.3 |
| 1170 | Ethanol or ethyl alcohol or ethanol solutions or ethyl alcohol solutions | 31.3 | 7.3 | 31.1 | 7.2 | 29.8 | 7.0 | 7.3 |
| 1202 | Diesel fuel, including gas oil or heating oil, light | S | S | S | S | S | S | 32.5 |
| 1203 | Gasoline, includes gasoline mixed with ethyl alcohol | S | S | S | S | 32.3 | 0.2 | S |
| 1307 | Xylenes | 40.3 | 18.7 | 42.2 | 18.2 | 42.2 | 22.7 | 21.5 |
| 1789 | Hydrochloric acid | 38.2 | 5.2 | 15.2 | 3.3 | 23.3 | 5.2 | 11.5 |
| 1805 | Phosphoric acid solution | 31.2 | 8.4 | 29.3 | 7.8 | 32.2 | 6.6 | 11.7 |
| 1824 | Sodium hydroxide solution | 24.4 | 4.1 | 24.6 | 4.0 | 22.3 | 6.6 | 12.9 |
| 1830 | Sulfuric acid with more than 51 percent acid | 45.8 | 5.5 | 39.2 | 6.1 | 30.0 | 8.0 | 33.3 |
| 1863 | Fuel, aviation, turbine engine | 39.6 | 1.5 | 38.8 | 1.7 | 35.8 | 9.0 | 23.5 |
| 1942 | Ammonium nitrate | 31.0 | 8.6 | 31.7 | 9.0 | 29.9 | 9.5 | 8.7 |
| 1987 | Alcohols, n.o.s | 7.1 | 2.8 | 7.1 | 3.1 | 7.7 | 3.6 | 5.0 |
| 1993 | Flammable liquids, n.o.s | 18.9 | 0.3 | 15.1 | 0.3 | 19.5 | 3.5 | 9.4 |
| 2448 | Sulfur, molten | 30.7 | 7.5 | 26.2 | 5.9 | 38.7 | 10.9 | 27.0 |
| 3082 | Environmentally hazardous substance, liquid, n.o.s. | 27.5 | 6.4 | 28.8 | 7.1 | 32.0 | 9.9 | 9.9 |
| 3257 | Elevated temperature liquid, n.o.s., at or above 100 c and below its flash point | 19.8 | 2.4 | 22.8 | 2.8 | 24.8 | 7.4 | 11.2 |
KEY: S = Withheld because estimate did not meet publication standards.
(1) UN numbers shown had the highest estimated weight without considering sampling variability. Since an “All other UN numbers” line is not shown, estimates do not add to total.
(2) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.
NOTES: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design and definitions. Links to this information on the Internet may be found at <www.census.gov/econ/cfs>.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2012 Economic Census: Transportation Commodity Flow Survey, December 2014.